UHF (Ultra High Freeqency) Radiation in the north of the ground into the air . Ideal for communication between air . Or space-to- ground And ground -to-air So we have to use that . The term was - in the plane , the signal UHF. The distance is shorter than VHF. So I UHF. It requires a satellite relay stations in the transmission distance.UHF band for the 690MHz - 960MHz frequency range 270MHz occupied hundreds of channels to set the wireless microphone . The desired frequency range can be extended to the field of wireless radiation .